C. difficile infection requires documenting the presence of toxin in the stools, usually by testing for the gene that produces toxin B, using a method called PCR. It is very sensitive, so it should not be used to test solid stools since that is likely a carrier state.
Definition of vassal. 1  1 : a person under the protection of a feudal lord to whom he has vowed homage and fealty : a feudal tenant. 2  2 : one in a subservient or subordinate position.
Definition of liege. 1  1a : a vassal bound to feudal service and allegiance (see allegiance 1a)b : a loyal subject. 2  2 : a feudal superior to whom allegiance and service are due.